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From the above code it's obvious that doing 2 DB queries isn't necessary because selected record count (0 or more) is enough to determine if there is enough data to be displayed.

Solution

1. in in "kDBList::GetSelectedCount all " add call to to "kDBList::Query" method if list wasn't queried create (like it's done in "kDBList::GetRecordsCount")
2. create "kDBTagProcessor::SelectedRecords" tag, that will call above method
3. add add "selected" type to "kDBTagProcessor::GridInfo" tag to allow retrieval of selected record count

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